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Chapter 9. Graphics

Naturally, GUI programs contain a large amount of graphics
code. By graphics code, we mean low-level graphics drawing
code used to create things that go beyond the built-in widgets.

You already know a bit about graphics programming from the
tutorial, but there is a lot more to doing it in Qt. In this chapter,
you will find sections on animation, printing, basic drawing operations,
and advanced drawing with two-dimensional transformations and
different coordinate systems. Not all of this will be interesting
to you at this time, so read intensively about what you need for your
current development project and just skim the remaining sections.

Animations

Qt contains a nice little class called QMovie that
allows programmers to include small animations in their work with
a minimum of fuss.

An animation consists of several pictures, or frames, that are shown in rapid succession. You could simply load the frames
into QPixmap objects and show them one after
the other, but QMovie does that for you.

While QMovie is designed to be independent
from the animation format, it is currently only possible to use
animated GIF (if Qt is compiled with GIF support) and MNG (if Qt is
compiled with MNG support).[22] You can’t load another animation
format like AVI or FLI frame by frame and add these frames to a QMovie object.
If you want to play these formats, you can still use
QMovie, but you need to write the decoding code yourself. How to do this is beyond the scope of ...

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